Telegraph-circuit.



A. ORLING.

TELEGRAPH CIRCUIT APPLICATION FILED JUNE 23. 1915.

UNITED STATES PATENT OFFICE.

AXEL OBLING, 0F HOLBORN, LONDON, ENGLAND, ASSIGNOR TO ORLINGS TELEGRAPH INSTRUMENTS SYNDICATE, LIMITED, 0]? LONDON, ENGLAND.

TELEGRAPH-CIRCUIT.

Specification of Letters Patent.

Patented'J 1111613, 1916.

T 0 all whom it may concern Be it known that I, AXEL ORLING, subject of the King of Sweden, residing at Bank Chambers, Holborn, London, England, have invented new and useful Improvements in Telegraph-Circuits, of which the following is a specification.

This invention relates to telegraph circuits, and its object is to eliminate or minimize the effect of rapid current disturbances which sometimes occur in such circuits.

According to the present invention, the effects of rapid current disturbances are eliminated or reduced in a closed local circuit varied by a magnifier or relay, by a contrivance connected to both sides of the recording or the like instrument in the 10- cal circuit, which suppresses, masks or damps out the rapid current disturbances, while leaving undisturbed or unaffected the effects on the instrument of steady signaling impulses or currents received from the cable or land line.

Several arrangements for carrying out the invention are illustrated on the accompanying drawing, in which Figure 1 is a diagram of the simplest arrangement for suppressing the effects of rapidcurrent disturbances in a local telegraph circuit varied by a relay. Fig. 2 is a diagram showing a modification of the arrangement according to Fig. 1. Fig. 8 is a diagram showing the preferred arrangement in a local circuit. Fig. 4 is a diagram showing a development of the arrangement according to Fig. 3. Fig. 5 is a diagram showing another development of Fig. 3.

In all the figures: a represents the receiving coil traversed by the currents from the cable. This coil a influences the resistance of a jet relay 6, the jet of which is in a local circuit a, as described in the specification of Patent No. 1,094,165. cl is the coil of a siphon telegraphic recorder. A simple arrangement for eliminating or reducing the effects of rapid current disturbances is shown in Fig. 1, wherein a condenser e is connected to both sides of the coil (Z of the recorder, in the local circuit 0. The above arrangement may be modified by including a resistance 7, preferably a non-inductive resistance, in the local circuit 0, beyond the condenser shunt, see Fig. 2.

. Another and more effective arrangement is shown 1n Flg. 3, whereln a resistance 7,

preferably a non-inductive resistance, is included in the local circuit 0 on one side of the coil cl. This resistance 7 is connected to a; condenser, divided into two or more sect1ons,-two only being shown, denoted g and h, the section or sections 9 being connected to one side of the resistance 7 and the section or sections h being connected to the other side of the resistance 7. A plate or coating i in common to the sections 9 and h of the condenser is connected to the other side of the receiving coil d. Such an arrangement will suppress rapid disturbances in the local circuit, without interfering with the operation of the instrument by the local circuit when the relay is influenced by telegraph currents or impulses.

In another arrangement, shown in Fig. 4, the recording or like instrument has two opposing windings (l d One winding al is connected to the local circuit 0 controlled by the relay 6, which influences the circuit by varying the resistance thereof, and the above described condenser-connected resistance f is also included in the circuit on one side of the winding d, with the connection of the common plate 71 of the condenser to the other side of the said winding P. The other winding d of the instrument is in a battery circuit j containing a resistance balancing the zero resistance of the relay.

' In a modified arrangement, Fig. 5, the instrument has but one winding cl, and this winding d and the condenser-connected resistance f, in addition to being in the local circuit 0, are also connected in the aforesaid battery and relay-balancing resistance circuit j, the battery of which tends to send a current through the winding d of the instrument in the reverse direction to that of the local circuit 0.

From the above described examples of arrangements for suppressing the effects of rapid current disturbances, it will be seen that in all cases these arrangements are connected to both sides of the coil of the recording or the like instrument. Such connection to'both sides of the coil is in my opinion essential. Also it is necessary for 1 these arrangements to be in a local or magnified circuit and not in the circuit of the cable or land line, the currents of which are feeble.

The relay employed is preferably of the diverted jet type described in the specification of Patent No. 1,094,165, mentioned above, certain examples therein illustrated showing relays which vary local circuits, as distinguished from making and breaking said circuits.

I claim:

1. In a telegraphic circuit, a relay a closed local circuit varied by said relay, a coil of a receiving instrument in said local circuit, a resistance in said local circuit and a condenser different sections of which are connected to said local circuit on opposite sides of said resistance and a section of which in common to said different sections is connected to said local circuit on the side of said coil remote from said resistance.

2. In a telegraphic circuit, a relay, a closed local circuit varied by said relay, a coil of a receiving instrument in said local circuit, a resistance in said local circuit, a condenser different sections of which are connected to said local circuit on opposite sides of said resistance and a section of which in common to said different sections is connected to said local circuit on the side of said coil remote from said resistance, a

second local circuit opposed to said firstmentioned local circuit connected to said coil and a resistance in said second local circuit balancing the'zero resistance of said relay.

3. In a telegraphic circuit, a relay, a closed local circuit varied by said relay, a coil of a receiving instrument having two opposing windings one of Which is in said local circuit, a resistance in said local circuit, a condenser different sections of which are connected to said local circuit on opposite sides of said resistance and a section of which in common to said different sections is connected to said local circuit on the side of said winding remote from said resistance, a second local circuit connected to said other winding and a resistance in said second local circuit balancing the zero resistance of said relay.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

O. J. Won'rn,

Copies of this patent may be obtained for five cents each, by addressing the "Commissioner of Patents,

' Washingtem, D. C." 

